6 is 2/3 of what number

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

Need showing work for this problem 56.25 ×25.80

An airplane is flying at an elevation of 5150 ft, directly above a straight highway. two motorists are driving cars on the highway on opposite sides of the plane, and the angle of depression to one car is 35 ̊ and to the other is 52 ̊. how far apart are the cars?